There is a community project to build autoreplicating 3d printers as well as robots called reprap(link) It occured to me that a metal that shifted between liquid n crystal forms at near human body temperature mold could build reusable laminate mechanical parts at mild temperatures.
You just have
some Ga liquid along with magnetic fibers, these make a kind of laminate felt at a magnetic field (the EM is kind of a combo of strand orienting with mold clamping) yet permits fluid flow or raster printing (possibly vector printing) absent an EM field
Ag or Au coated Co or supermagnet "filings" create the orientable strands when Amorphously blended with the Ga makes a squishy metal paste Oriented with an EM field they cease being squishy. This is then printed as a kind of 3d metal cardboard
As a result of the amalgam blend the metal laminate is firm at temps below 120F above that at warm water temperature they turn back into squishy metal liquid felt
One of the points of metal is that it can have structural surface channels that with a thick 2 mm electroplating would give stronger parts than many plastics, it also conducts electricity permitting printable motors.
I read that there is a goal to make reprap produce all of its own parts, This is kind of a universal shapeable goop that makes structural as well as electrical parts. Very awesome of course would be to print induction coils so that the printed parts could also power up from EM possibly from another reprap creation